kernel/git/next/linux-next.git/Documentation/mm, branch master

Docs/mm/damon/design: update for probe_hits_wsum DAMOS core filter

2026-09-14T04:32:48+00:00

Update DAMON design document for the newly added probe hits weighted sum based DAMOS core filter type. Link: https://lore.kernel.org/20260911135510.96914-7-sj@kernel.org Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Suren Baghdasaryan Cc: Vlastimil Babka

Documentation/mm: update DAX vmemmap deduplication docs

2026-09-14T04:32:45+00:00

Device DAX now uses the common per-zone shared tail page for vmemmap deduplication. The old documentation still described a DAX-specific layout with a separately populated tail vmemmap page and half the HugeTLB savings. Update the generic and powerpc documentation to describe the shared layout. In the powerpc document, keep the radix and 64K-specific details, drop the duplicated 4K PUD arithmetic, and replace the repeated device-dax diagrams with a single parameterized PMD/PUD diagram. Link: https://lore.kernel.org/20260911050228.58884-12-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton Acked-by: Qi Zheng Cc: David Hildenbrand (Arm) Cc: Jonathan Corbet Cc: Lorenzo Stoakes Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Oscar Salvador Cc: Randy Dunlap

Docs/mm/damon/design: update for pgidle_set probe filter

2026-09-14T04:32:42+00:00

Update DAMON design document for the newly added pgidle_set probe filter type. Link: https://lore.kernel.org/20260910142234.171562-6-sj@kernel.org Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Suren Baghdasaryan Cc: Vlastimil Babka

mm: change the contract for free_pgtables(), update docs

2026-09-14T04:32:27+00:00

Now that page tables are freed after an RCU grace period, it is safe for read-only page table walkers to walk page table ranges that are being concurrently torn down, provided the mm is kept alive via mmgrab(). It is however unsafe for writers to do so, as they must obtain an appropriate lock to do so safely. Update the pte_offset_map_lock()'s comment block to reflect this. Similarly update the process addresses documentation. Link: https://lore.kernel.org/20260908-rcu-pagetable-freeing-v2-12-1f60b64e878e@kernel.org Signed-off-by: Lorenzo Stoakes (ARM) Signed-off-by: Andrew Morton Acked-by: Kiryl Shutsemau (Meta) Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: "Aneesh Kumar K.V" Cc: Anton Ivanov Cc: Arnd Bergmann Cc: Baolin Wang Cc: Barry Song Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Christian Zankel Cc: Dave Hansen Cc: David Hildenbrand Cc: David S. Miller Cc: Dev Jain Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Hugh Dickins Cc: Ingo Molnar Cc: James Bottomley Cc: Jason Gunthorpe Cc: Johannes Berg Cc: John Hubbard Cc: John Paul Adrian Glaubitz Cc: Jonas Bonn Cc: Lance Yang Cc: Liam R. Howlett Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Marc Rutland Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Simek Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Peter Xu Cc: Peter Zijlstra Cc: Richard Henderson Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Ryan Roberts Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Vlastimil Babka Cc: WANG Xuerui Cc: Will Deacon Cc: Yoshinori Sato Cc: Zi Yan

Docs/mm/damon/design: fix broken :ref: usage and a typo

2026-09-14T04:32:22+00:00

The Statistics section refers readers to the DAMON sysfs interface documentation for how to read the statistics, using a ':ref:' role. However, the role name has a superfluous 's' appended (':ref:s' instead of ':ref:'). Moreover, its target label 'sysfs_stats' does not exist; the correct label is 'sysfs_schemes_stats'. Fix both. Also fix a typo, 'frequenceis' -> 'frequencies', in the Adaptive Regions Adjustment section. Link: https://lore.kernel.org/20260908135257.97523-1-sj@kernel.org Signed-off-by: Zenghui Yu (Huawei) Reviewed-by: SJ Park Signed-off-by: SJ Park Signed-off-by: Andrew Morton

docs/mm: ksm: use the renamed ksm structure names

2026-09-14T04:32:14+00:00

The Reference section of ksm.rst asks mm/ksm.c for mm_slot, stable_node and rmap_item. Commit 21fbd59136e0 ("ksm: add the ksm prefix to the names of the ksm private structures") renamed them to ksm_mm_slot, ksm_stable_node and ksm_rmap_item. Since then only ksm_scan is rendered and the three structures are missing from the generated documentation. Use the current names. Link: https://lore.kernel.org/20260905084034.39521-1-kmehltretter@gmail.com Fixes: 21fbd59136e0 ("ksm: add the ksm prefix to the names of the ksm private structures") Assisted-by: LLM Signed-off-by: Karl Mehltretter Signed-off-by: Andrew Morton Reviewed-by: Randy Dunlap Acked-by: David Hildenbrand (Arm)

Docs/mm/damon/maintainer-profile: update AI review for Sashiko replies

2026-09-14T04:32:07+00:00

In the past, sharing Sashiko review results was tedious. Also it was suggested to minimize the recipients on the sharing mails. Hence the AI review section of DAMON maintainer profile document was updated to give guidance about available tools for making the sharing easier, and how the recipients list should be managed. Now DAMON is onboarded [1] to Sashiko's automatic review replies feature. Sashiko directly sends its reviews as replies to the patch mail thread. It also reduces the recipients list to deliver the reporting to only the author and the mailing list. Remove the old guidance that is no more necessary but only confusing. Link: https://lore.kernel.org/20260902054747.99370-12-sj@kernel.org Link: https://github.com/sashiko-dev/sashiko/commit/b554c7b6e733 [1] Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Kunwu Chan

Docs/mm/damon/design: document probe preps

2026-09-14T04:31:52+00:00

Update DAMON design document for the newly added DAMON probe preps feature. Link: https://lore.kernel.org/20260901132506.99243-16-sj@kernel.org Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka

Docs/mm/damon/design: document pgidle_unset probe filter type

2026-09-14T04:31:49+00:00

Update DAMON design document for the newly added pgidle_unset probe filter type. Also use a list for the types, as it becomes not very easy to read the whole types in a simple sentence. Link: https://lore.kernel.org/20260901132506.99243-5-sj@kernel.org Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka

Docs/mm/damon/design: cocument hugepage_mem_bp target metric

2026-09-14T04:31:36+00:00

Document hugepage_mem_bp metric exposed by sysfs. Link: https://lore.kernel.org/20260831144732.80910-4-sj@kernel.org Signed-off-by: Asier Gutierrez Signed-off-by: SJ Park Signed-off-by: Andrew Morton Reviewed-by: SJ Park Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Suren Baghdasaryan Cc: Vlastimil Babka